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// SAX parser factory.
// http://www.saxproject.org
// No warranty; no copyright -- use this as you will.
// $Id: ParserFactory.java,v 1.2 2004/11/03 22:53:09 jsuttor Exp $

package org.xml.sax.helpers;

import org.xml.sax.Parser;


/**
 * Java-specific class for dynamically loading SAX parsers.
 *
 * <blockquote>
 * <em>This module, both source code and documentation, is in the
 * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
 * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
 * for further information.
 * </blockquote>
 *
 * <p><strong>Note:</strong> This class is designed to work with the now-deprecated
 * SAX1 {@link org.xml.sax.Parser Parser} class.  SAX2 applications should use
 * {@link org.xml.sax.helpers.XMLReaderFactory XMLReaderFactory} instead.</p>
 *
 * <p>ParserFactory is not part of the platform-independent definition
 * of SAX; it is an additional convenience class designed
 * specifically for Java XML application writers.  SAX applications
 * can use the static methods in this class to allocate a SAX parser
 * dynamically at run-time based either on the value of the
 * `org.xml.sax.parser' system property or on a string containing the class
 * name.</p>
 *
 * <p>Note that the application still requires an XML parser that
 * implements SAX1.</p>
 *
 * @author David Megginson
 * @version 2.0.1 (sax2r2)
 * @since SAX 1.0
 * @deprecated This class works with the deprecated
 * {@link org.xml.sax.Parser Parser}
 * interface.
 */
public class ParserFactory {
    private static SecuritySupport ss = new SecuritySupport();

    /**
     * Private null constructor.
     */
    private ParserFactory() {
    }


    /**
     * Create a new SAX parser using the `org.xml.sax.parser' system property.
     *
     * <p>The named class must exist and must implement the
     * {@link org.xml.sax.Parser Parser} interface.</p>
     *
     * @throws java.lang.NullPointerException   There is no value
     *                                          for the `org.xml.sax.parser' system property.
     * @throws java.lang.ClassNotFoundException The SAX parser
     *                                          class was not found (check your CLASSPATH).
     * @throws IllegalAccessException           The SAX parser class was
     *                                          found, but you do not have permission to load
     *                                          it.
     * @throws InstantiationException           The SAX parser class was
     *                                          found but could not be instantiated.
     * @throws java.lang.ClassCastException     The SAX parser class
     *                                          was found and instantiated, but does not implement
     *                                          org.xml.sax.Parser.
     * @see #makeParser(java.lang.String)
     * @see org.xml.sax.Parser
     */
    public static Parser makeParser()
            throws ClassNotFoundException,
            IllegalAccessException,
            InstantiationException,
            NullPointerException,
            ClassCastException {
        String className = ss.getSystemProperty("org.xml.sax.parser");
        if (className == null) {
            throw new NullPointerException("No value for sax.parser property");
        } else {
            return makeParser(className);
        }
    }


    /**
     * Create a new SAX parser object using the class name provided.
     *
     * <p>The named class must exist and must implement the
     * {@link org.xml.sax.Parser Parser} interface.</p>
     *
     * @param className A string containing the name of the
     *                  SAX parser class.
     * @throws java.lang.ClassNotFoundException The SAX parser
     *                                          class was not found (check your CLASSPATH).
     * @throws IllegalAccessException           The SAX parser class was
     *                                          found, but you do not have permission to load
     *                                          it.
     * @throws InstantiationException           The SAX parser class was
     *                                          found but could not be instantiated.
     * @throws java.lang.ClassCastException     The SAX parser class
     *                                          was found and instantiated, but does not implement
     *                                          org.xml.sax.Parser.
     * @see #makeParser()
     * @see org.xml.sax.Parser
     */
    public static Parser makeParser(String className)
            throws ClassNotFoundException,
            IllegalAccessException,
            InstantiationException,
            ClassCastException {
        return (Parser) NewInstance.newInstance(
                ss.getContextClassLoader(), className);
    }

}
